31310212120 has 64 divisors (see below), whose sum is σ = 76947978240. Its totient is φ = 11371363200.

The previous prime is 31310212117. The next prime is 31310212147. The reversal of 31310212120 is 2121201313.

It is a junction number, because it is equal to n+sod(n) for n = 31310212094 and 31310212103.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 312969 + ... + 400711.

It is an arithmetic number, because the mean of its divisors is an integer number (1202312160).

Almost surely, 2^31310212120 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31310212120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38473989120).

31310212120 is an abundant number, since it is smaller than the sum of its proper divisors (45637766120).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

31310212120 is a wasteful number, since it uses less digits than its factorization.

31310212120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88576 (or 88572 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 31310212120 its reverse (2121201313), we get a palindrome (33431413433).

The spelling of 31310212120 in words is "thirty-one billion, three hundred ten million, two hundred twelve thousand, one hundred twenty".